Improvement



-UNITEE STATES PATENT OFFICE.

ASHBEL I). BARLOW, OF KALAMAZOO, l\/IICl[IGrAl\T.`

IMPROVEMENT iN ROCK-SHAFT FOR GANG-SAWS.

Specification forming part of Letters Patent No. S8535, dated April 6,1869.

To all whom it may concern:

Be it known that I, AsnEEL P. BAELoW, of Kalamazoo, in the county ofKalamazoo and State of Michigan, have invented a new and usefulImprovement in Saw-Mills; and I do hereby declare that the following isafull and exact description thereof, reference being had to theaccompanying drawings and to the letters of reference marked thereon.

Vthat the arm may be detached from the shaft and a shorter or longer armpnt in its place, which permits a greater or less oscillation of thesaw.

This improvement is applicable to all reciprocating saws, whether ingangs, single, or in sash or muley ways.

Figure l is a longitudinal view of the rockshaft, with jam-nuts,face-plate, and guideblocks attached. Fig. 2 is a View of the samewithout the face-plate and guide. Fig. 3 is a view of cross-section offace-plate and guide. Fig. et is a side view of face-plate andguidep'ins without the guide-blocks; and Fig. 5 is an end view of shaftC, and shows how arm C is attached.

A and A are the guide-blocks, attached on either side of the crank-pinD, which are centrally attached to pins g y', and can turn on said pins,so as to allow the guide-blocks to easily, and at all times, accommodatethemselves to the change of direction of the guide-,-

ways." C is the shaft or bar, to which the detachable arm C is attachedby the hole through the arm and hub d', and s secured in its place by akey, d, driven into a keyseat, in the ordinary manner. B B are jam.nuts, working on a screw-thread on pin` D. These jam-nuts are used toregulate the eX- tent of the side motion to the shaft or rod, upon whicheither gang or muley saws are attached, and'enable me to keep the sawssteady in the direction of their out, consequently making strai ghterand smoother lumber--an obj ect attained, by this simple means, cf greatimportance, in producing better and more perfeet lumber. E is theface-plate, with hub G, which receives the pin D, and holds pins g g',to which guide-blocks A A are attached. Pins g g are equidistant fromthe center vof hub Gr.

The changing the length of the arm, in order to give greater or lessoscillation to the saw-bar, is a great advantage in the sawing ofdifferent-sized logs, and no provision has heretofore been made for suchcontingency, while the change is easily and quickly made, by driving outthe key d and shifting arm C, for a longer or shorter one, as the case.may be.

The guide-blocks A A may be of any shape desired, either round, square,or of any other shape to work in the guide-ways.

I am aware that it is not new to so construct a crank-shaft that the armmay be removed from the shaft, so as to place a longer or shorter armupon said shaft 5 and I do not claim for such construction generally, orbroadly; nor do I lay any cla-im to the manner of fastening such arm tothe shaft, for the. key or spline driven into grooves for such purposeis old 5 and I only lay claim to the application of such mea-ns as'Ihave described for controlling the amount of oscillation of the saw, tobetter adapt the saw to dierent sizes of logs, and greater or less feedofthe log to the saw, I being the first to make such application.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, :iss 1. Making the oscillation of the saw greater orless by means of the adjustable rock-shaft device, consisting of theremovable arm C and pin D, when attached to the shaft or bar C', in themanner and for the purpose set forth.

2. Regulating the side motion of the bar C', with relation to theface-plate E and guideblocks A A', by means of nuts B B, substantiallyas set forth.

3. The guide-blocks A A', when constructed and arranged to operate inthe manner, and with face-plate E, pin D, and arm C, substantially asdescribed. ASHBEL P. BARLOVV.

' Witnesses:

ALEX. MAEON, H. H. DoUELEDAv.

